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Compact Cage Antenna : by: Vladislav Shcherbakov, RU3ARJ

Everyone knows "classical" quad antenna. Its perimeter is equal to wavelength. Each side of the quad is 1/4 wavelength. Amplification of the "classical" quad antenna is 3-dBi, input impedance (in a free space) is close to 120-Ohm. Good antenna but the size!

It is possible to reduce its size by folding it in a "cage" shape. The simplest cage in which the antenna may be transformed is a cage of 10 sections 0.11 wavelength each. The Compact Cage Antenna (CCA) gain is 1.5-dBi and input impedance is close to 50-Ohm.


PDF file, 170 KB (ANTENTOP-01-2009, pp: 32- 35)


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Contents for AntenTop 01- 2009

 

Vladislav Shcherbakov, RU3ARJ

 

Contents for AntenTop 01- 2009

 

 

 

 

 

 

Lightning Links to Open Book
Antenna Theory Helical Antennas Useful Pieces Simple Keys
Antenna Practice TV Antennas Propagation QRO HF Tube Amplifiers
136 kHz- Antennas Coaxial cables LDE QRO HF Transistor Amplifiers
HF- Antennas Two wire lines Interferences QRP
HF- RX Antennas Feeder's Toolkit Filters TVI/RFI QRP PA
50- MHz Antennas HF ATU Homebrew Receivers Radio and Ham History
VHF- Antennas ATU for the 6- meters Homebrew Transmitters Old Russian/USSR Radio Equipment
UHF -Antennas Antenna Parts Matching Circuit for P.A Amateurs Awards
EH- Antennas Antenna Towers QRP Transceivers Free Radio and Electronics e- Books
TV Channels and Frequencies Reception of Weather Stations Useful Data FM Radio Channels and Frequencies
MagLoop Antennas Home-Brew Technics in Antenna Tools PSU for Amateur Radio from Computer Free Programme and Utility

 

 

 

 

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Last Updated:

March 29, 2016 9:05